Intelligent capacitor reactive power comprehensive compensation method and system based on photovoltaic controller, and medium

Abstract

The invention relates to the technical field of photovoltaic power generation systems, and discloses an intelligent capacitor reactive power comprehensive compensation method and system based on a photovoltaic controller, and a medium, and the method comprises the steps: obtaining a commercial power reactive power value and a photovoltaic reactive power value through detection; comparing the commercial power reactive power value and the photovoltaic reactive power value with a preset reactive power threshold value, judging and determining a compensation signal; if the commercial power reactive power value or the photovoltaic reactive power value is greater than the reactive power threshold value, outputting a corresponding compensation signal to perform reactive power compensation; and if the commercial power reactive power value or the photovoltaic reactive power value is smaller than the reactive power threshold value, outputting a corresponding compensation signal to stop reactive power compensation. According to the invention, operation data of the commercial power system and the photovoltaic power generation system can be collected, and accurate and effective reactive compensation can be carried out on the commercial power system and the photovoltaic power generation system.

Description

Technical Field

[0001] This application relates to the technical field of photovoltaic power generation systems, and in particular to an intelligent capacitor reactive power comprehensive compensation method, system and medium based on a photovoltaic controller. Background Art

[0002] In a photovoltaic power generation system, as a core device, the photovoltaic controller is mainly used to manage and control the power flow between the solar panels and the battery, thereby regulating the output power of photovoltaic power generation, and at the same time controlling the intelligent capacitor for reactive power regulation.

[0003] However, traditional photovoltaic controllers usually only collect the mains power, resulting in the intelligent capacitor being unable to accurately and effectively compensate for the reactive power generated in the mains power system, thereby reducing the power factor of the power system, affecting the power quality, and even increasing the line loss. Therefore, there is an urgent need for a new type of photovoltaic controller to enable the intelligent capacitor to perform comprehensive and effective reactive power compensation. Summary of the Invention

[0004] In order to enable the intelligent capacitor to perform effective reactive power compensation, this application provides an intelligent capacitor reactive power comprehensive compensation method, system and medium based on a photovoltaic controller.

[0005] An intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller provided by this application adopts the following technical solutions: An intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller includes: Detecting the mains reactive power value and the photovoltaic reactive power value; Comparing and judging the mains reactive power value, the photovoltaic reactive power value with a preset reactive power threshold to determine a compensation signal; If the mains reactive power value or the photovoltaic reactive power value is greater than the reactive power threshold, outputting a corresponding compensation signal for reactive power compensation; If the mains reactive power value or the photovoltaic reactive power value is less than the reactive power threshold, outputting a corresponding compensation signal to stop reactive power compensation.

[0006] By adopting the above technical solution, when the photovoltaic controller is applied to a photovoltaic application scenario, data of both the mains power system and the photovoltaic power generation system are collected, and the data of the mains power system and the photovoltaic power generation system are distinguished to obtain the mains reactive power value and the photovoltaic reactive power value. Then, the compensation signal is determined by comparing the mains reactive power value and the photovoltaic reactive power value with a preset reactive power threshold. If the mains reactive power value is greater than the reactive power threshold, a corresponding compensation signal is output to the photovoltaic controller to control the intelligent capacitor to perform reactive power compensation on the mains power system; if the photovoltaic reactive power value is greater than the reactive power threshold, a corresponding compensation signal is output to perform reactive power compensation on the photovoltaic power generation system; if the mains reactive power value is less than the preset reactive power threshold, a corresponding compensation signal is output to stop the reactive power compensation of the mains power system; if the photovoltaic reactive power value is less than the preset reactive power threshold, a corresponding compensation signal is output to stop the reactive power compensation of the photovoltaic power generation system. By collecting and distinguishing the operation data of the mains power system and the photovoltaic power generation system through the above method, the intelligent capacitor can effectively and accurately compensate both the photovoltaic power generation system and the mains power system, improving the power factor and power quality of the power system and reducing the line loss.

[0007] Optionally, a pre-write detection program; Obtain mains voltage data, mains current data, mains power data, photovoltaic voltage data, photovoltaic current data, and photovoltaic power data; Separate the mains voltage data, mains current data, mains power data from the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data through the detection program; Determine the mains reactive power value through the mains voltage data, mains current data, and mains power data, and determine the photovoltaic reactive power value through the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data.

[0008] By adopting the above technical solution, after the photovoltaic controller collects the mains voltage data, mains current data, mains power data, photovoltaic voltage data, photovoltaic current data, and photovoltaic power data, it will separate the mains voltage data, mains current data, mains power data from the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data through the detection program, and determine the mains reactive power value through the mains voltage data, mains current data, and mains power data, and determine the photovoltaic reactive power value through the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data, which is convenient for comparing and judging the mains reactive power value and the photovoltaic reactive power value with the reactive power threshold to determine the compensation signal. These series of measures significantly improve the efficiency and accuracy of data analysis, which is beneficial for the intelligent capacitor to perform precise and effective compensation.

[0009] Optionally, detect the four-phase electricity through the detection program; Mains voltage data, mains current data, and mains power data are detected from one-phase line and four-phase line; Photovoltaic voltage data, photovoltaic current data, and photovoltaic power data are detected from two-phase line and three-phase line; By adopting the above technical solution, the operation data of the mains power system and the photovoltaic power generation system can be collected separately. Specifically, the detection program will detect the four-phase lines in the power system. The mains power system is located on the one-phase line and the four-phase line, and the photovoltaic power generation system is located on the two-phase line and the three-phase line. The detection program detects mains voltage data, mains current data, and mains power data from the one-phase line and the four-phase line; the detection program detects photovoltaic voltage data, photovoltaic current data, and photovoltaic power data from the two-phase line and the three-phase line.

[0010] Optionally, a preset comprehensive compensation program; Determine the mains reactive power difference through the mains reactive power value and the reactive power threshold; Determine the photovoltaic reactive power difference through the photovoltaic reactive power value and the reactive power threshold; Determine the compensation strategy through the comprehensive compensation program, the mains reactive power difference, and the photovoltaic reactive power difference and output it; If both the mains reactive power value and the photovoltaic reactive power value are greater than the reactive power threshold, and the mains reactive power difference is greater than the photovoltaic reactive power difference, output the corresponding compensation signal to preferentially compensate the mains power system; If both the mains reactive power value and the photovoltaic reactive power value are greater than the reactive power threshold, and the photovoltaic reactive power difference is greater than the mains reactive power difference, output the corresponding compensation signal to preferentially compensate the photovoltaic power generation system; If the mains reactive power value is greater than the reactive power threshold, while the photovoltaic reactive power value is less than the reactive power threshold, output the corresponding compensation signal to compensate the reactive power of the mains power system; If the photovoltaic reactive power value is greater than the reactive power threshold, while the mains reactive power value is less than the reactive power threshold, output the corresponding compensation signal to compensate the reactive power of the photovoltaic power generation system; If both the mains reactive power value and the photovoltaic reactive power value are less than the reactive power threshold, output the corresponding compensation signal to stop compensation.

[0011] By adopting the above technical solution, the reactive power of the mains power system and the photovoltaic power generation system can be accurately and efficiently compensated respectively. Specifically, after the detection program detects the mains reactive power value and the photovoltaic reactive power value, the mains reactive power difference is determined by the mains reactive power value and the reactive power threshold, and the photovoltaic reactive power difference is determined by the photovoltaic reactive power value and the reactive power threshold. The comprehensive compensation program determines the compensation strategy according to the mains reactive power difference and the photovoltaic reactive power difference and outputs it to the photovoltaic controller, and then controls the intelligent capacitor to perform reactive power compensation.

[0012] When both the mains reactive power value and the photovoltaic reactive power value are greater than the reactive power threshold, and the mains reactive power difference is greater than the photovoltaic reactive power difference, a corresponding compensation signal is output to the photovoltaic controller to control the intelligent capacitor to preferentially perform reactive power compensation on the mains power system; when both the mains reactive power value and the photovoltaic reactive power value are greater than the reactive power threshold, and the photovoltaic reactive power difference is greater than the mains reactive power difference, a corresponding compensation signal is output to the photovoltaic controller to control the intelligent capacitor to preferentially perform reactive power compensation on the photovoltaic power generation system; when the mains reactive power value is greater than the reactive power threshold and the photovoltaic reactive power value is less than the reactive power threshold, a corresponding compensation signal is output to the photovoltaic controller to control the intelligent capacitor to preferentially perform reactive power compensation on the mains power system; when the photovoltaic reactive power value is greater than the reactive power threshold and the mains reactive power value is less than the reactive power threshold, a corresponding compensation signal is output to the photovoltaic controller to control the intelligent capacitor to preferentially perform reactive power compensation on the photovoltaic power generation system; when both the mains reactive power value and the photovoltaic reactive power value are less than the reactive power threshold, a corresponding compensation signal is output to the photovoltaic controller to control the intelligent capacitor to stop compensation. By the above steps, the reactive power of the mains power system and the photovoltaic power generation system is compensated, improving the accuracy and efficiency of the intelligent capacitor for reactive power compensation.

[0013] Optionally, a preset monitoring program is provided; The mains voltage data, mains current data, mains power data, photovoltaic voltage data, photovoltaic current data and photovoltaic power data are remotely monitored through the monitoring program; The operating state data is determined by the mains voltage data, mains current data, mains power data, photovoltaic voltage data, photovoltaic current data and photovoltaic power data and output to the monitoring platform; Remote monitoring and management are realized through the monitoring platform.

[0014] By adopting the above technical solutions, the operating states of the mains power system and the photovoltaic power generation system can be remotely monitored and managed. Specifically, the monitoring program can obtain the mains voltage data, mains current data, mains power data, photovoltaic voltage data, photovoltaic current data and photovoltaic power data through remote detection, and then the processor converts the mains voltage data, mains current data, mains power data, photovoltaic voltage data, photovoltaic current data and photovoltaic power data into operating state data that can be recognized by the staff, and outputs the operating state data to the monitoring platform through communication devices such as computers, so as to remotely monitor and compensate the reactive power of the mains power system and the photovoltaic power generation system, facilitate real-time adjustment of the operating states of the mains power system and the photovoltaic power generation system, and improve the timeliness of reactive power regulation.

[0015] Optionally, the mains reactive power detection value and the photovoltaic reactive power detection value are detected again; The compensation signal is determined by comparing and judging the mains reactive power detection value and the photovoltaic reactive power detection value with the reactive power threshold; If the mains reactive power detection value and the photovoltaic reactive power detection value are still greater than the reactive power threshold, the corresponding compensation signal is continuously output for reactive power compensation until the mains reactive power detection value and the photovoltaic reactive power detection value are equal to the reactive power threshold; If the mains reactive power detection value and the photovoltaic reactive power detection value are still less than the reactive power threshold, the corresponding compensation signal is continuously output to stop compensation until the mains reactive power detection value and the photovoltaic reactive power detection value are equal to the reactive power threshold.

[0016] By adopting the above technical solutions, it is possible to check whether the compensation of the compensated mains power system and photovoltaic power generation system is in place. After the reactive power of the mains power system and the photovoltaic power generation system is compensated by the comprehensive compensation program, the mains reactive power detection value and the photovoltaic reactive power detection value are detected again through the detection program. When the mains reactive power detection value and the photovoltaic reactive power detection value are still greater than the reactive power threshold, the corresponding compensation signal is continuously output for reactive power compensation until the mains reactive power detection value and the photovoltaic reactive power detection value are equal to the reactive power threshold; when the mains reactive power detection value and the photovoltaic reactive power detection value are still less than the reactive power threshold, the corresponding compensation signal is continuously output to stop compensation until the mains reactive power detection value and the photovoltaic reactive power detection value are equal to the reactive power threshold. By re-detecting and compensating the reactive power of the mains power system and the photovoltaic power generation system through the above method, it is convenient to confirm the compensation effect. When the compensation does not reach the specified value, it can be discovered and compensated in time, ensuring the compensation effect of the intelligent capacitor.

[0017] Optionally, a compensation error value of the intelligent capacitor is calculated through the detected value of the commercial power reactive power and the detected value of the photovoltaic reactive power and the reactive power threshold value; The compensation error value of the intelligent capacitor is compared with a preset compensation error threshold value; If the compensation error value of the intelligent capacitor is less than the compensation error threshold value, a corresponding compensation signal is output for compensation or the compensation is stopped; If the compensation error value of the intelligent capacitor is greater than the compensation error threshold value, a corresponding alarm signal is output to the staff to prompt a fault of the intelligent capacitor.

[0018] By adopting the above technical solution, the fault of the intelligent capacitor can be timely detected for maintenance. Specifically, after obtaining the detected value of the commercial power reactive power and the detected value of the photovoltaic reactive power, the compensation error value of the intelligent capacitor is calculated through the detected value of the commercial power reactive power and the detected value of the photovoltaic reactive power and the reactive power threshold value. When the compensation error value is less than the compensation error threshold value, it indicates that the working state of the intelligent capacitor is normal, and a corresponding compensation signal can be output to continue the compensation or stop the compensation; when the compensation error value is greater than the compensation error threshold value, a corresponding alarm signal is output to the staff to prompt a fault of the intelligent capacitor, which needs to be repaired.

[0019] Optionally, the rated compensation data of the intelligent capacitor is calculated through the commercial power reactive power value and the photovoltaic reactive power value and the reactive power threshold value; The actual compensation data of the intelligent capacitor is calculated through the detected value of the commercial power reactive power and the detected value of the photovoltaic reactive power and the reactive power threshold value; The actual compensation efficiency of the intelligent capacitor is determined through the actual compensation data of the intelligent capacitor and the rated compensation data of the intelligent capacitor; A corresponding adjustment signal is output according to the difference between the actual compensation efficiency of the intelligent capacitor and the preset rated compensation efficiency to improve the rated compensation efficiency of the intelligent capacitor.

[0020] By adopting the above technical solution, when the intelligent capacitor fails, there is no need to immediately disconnect the intelligent capacitor for repair. Instead, only by adjusting the rated compensation efficiency of the intelligent capacitor can it continue to be used, and the emergency effect is good. Specifically, first calculate the rated compensation data of the intelligent capacitor by comparing the detected municipal power reactive power value and photovoltaic reactive power value with the reactive power threshold. Then calculate the actual compensation data of the intelligent capacitor by comparing the detected municipal power reactive power detection value and photovoltaic reactive power detection value with the reactive power threshold. Next, output a corresponding adjustment signal to the photovoltaic controller based on the difference between the actual compensation efficiency of the intelligent capacitor and the preset rated compensation efficiency. The photovoltaic controller is used to increase the rated compensation efficiency of the intelligent capacitor, thereby improving the actual compensation efficiency and actual compensation data of the intelligent capacitor to meet the required compensation power requirement. By adjusting the rated compensation efficiency of the intelligent capacitor through the above method, when the intelligent capacitor fails, it can continue to be used for a period of time without immediately cutting off the intelligent capacitor, avoiding the loss caused by the reduction of the power factor after cutting off the intelligent capacitor.

[0021] An intelligent capacitor reactive power comprehensive compensation system based on a photovoltaic controller provided by this application adopts the following technical solution: An intelligent capacitor reactive power comprehensive compensation system based on a photovoltaic controller includes: A detection module for detecting four-phase electricity and determining the municipal power reactive power value and photovoltaic reactive power value based on the detection results.

[0022] A comprehensive compensation module for comparing and judging the compensation urgency by comparing the municipal power reactive power value and photovoltaic reactive power value with the reactive power threshold, and preferentially compensating the side with the higher reactive power value.

[0023] A monitoring module for remotely monitoring and managing the operating states of the municipal power system and the photovoltaic power generation system.

[0024] A database for storing data, including the threshold of the reactive power, the compensation error threshold, and the rated compensation efficiency.

[0025] An adjustment module, according to the detection results of the detection module, calls the threshold of the reactive power, the compensation error threshold, and the rated compensation efficiency from the database for comparison calculation and processing, outputs a corresponding compensation signal to adjust the reactive power values of the municipal power system and the photovoltaic power generation system; or outputs a corresponding adjustment signal to adjust the rated compensation efficiency of the intelligent capacitor.

[0026] By adopting the above technical solution, the power detection module is used to detect the four-phase electricity to obtain the reactive power value of the commercial power and the reactive power value of the photovoltaic power generation. The comprehensive compensation module is used to comprehensively compensate the commercial power system and the photovoltaic power generation system. The monitoring module is used to remotely monitor and manage the commercial power system and the photovoltaic power generation system. The database stores the reactive power threshold data, the compensation error threshold data, and the rated compensation efficiency data. The adjustment module is used to call and process the data in the database, and output the corresponding compensation signal or adjustment signal to accurately and effectively compensate the reactive power of the commercial power system and the photovoltaic power generation system.

[0027] An intelligent capacitor reactive power comprehensive compensation medium based on a photovoltaic controller provided by this application adopts the following technical solution: An intelligent capacitor reactive power comprehensive compensation medium based on a photovoltaic controller stores a computer program that can be loaded and executed by a processor, such as any one of the intelligent capacitor reactive power comprehensive compensation methods based on a photovoltaic controller in claims 1 to 8.

[0028] By adopting the above technical solution, the computer program is stored by a computer-readable storage medium.

[0029] In summary, this application includes at least one of the following beneficial technical effects: Compared with only collecting data from the commercial power system, collecting and separately analyzing both the commercial power system and the photovoltaic power generation system can accurately and effectively compensate the reactive power of the commercial power system and the photovoltaic power generation system, improve the power quality, and reduce the line loss. When reactive power compensation is required for both the commercial power system and the photovoltaic power generation system, the comprehensive compensation program will output the corresponding compensation signal to the photovoltaic controller to preferentially compensate the side with the higher reactive power value, improve the compensation efficiency, and effectively reduce the line loss. After compensating the commercial power system and the photovoltaic power generation system, the reactive power detection values of the commercial power system and the photovoltaic power generation system are detected again to obtain the actual compensation efficiency data of the intelligent capacitor, and the rated compensation efficiency of the intelligent capacitor is adjusted to meet the requirements of reactive power compensation. Description of the Drawings

[0030] Figure 1 is a schematic flowchart of an intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller in Embodiment 1 of this application.

[0031] Figure 2 is a schematic flowchart of step S2.

[0032] Figure 3 is a schematic flowchart of step S3.

[0033] Figure 4It is a schematic flowchart of step S4.

[0034] Figure 5 It is a schematic flowchart of step S4.

[0035] Figure 6 It is a schematic flowchart of step S5.

[0036] Figure 7 It is a schematic flowchart of step S6.

[0037] Figure 8 It is a schematic flowchart of step S7.

[0038] Figure 9 It is a schematic flowchart of step S8.

[0039] Figure 10 It is a schematic diagram of a module of an intelligent capacitor reactive power comprehensive compensation system based on a photovoltaic controller in Embodiment 2 of the present application.

[0040] Description of reference numerals: 1. Detection module; 2. Comprehensive compensation module; 3. Monitoring module; 4. Database; 5. Regulation module; 51. Processor. Detailed implementation manners

[0041] The following further describes the present application in detail with reference to the attached Figures 1-10 drawings.

[0042] Embodiments of the present application disclose an intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller. Embodiment

[0043] Referring to Figure 1 , an intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller includes the following steps: S1. Detect the mains reactive power value and the photovoltaic reactive power value; S11. Determine the compensation signal by comparing the mains reactive power value, the photovoltaic reactive power value with a preset reactive power threshold; S12. If the mains reactive power value or the photovoltaic reactive power value is greater than the reactive power threshold, output the corresponding compensation signal for reactive power compensation; S13. If the mains reactive power value or the photovoltaic reactive power value is less than the reactive power threshold, output the corresponding compensation signal to stop reactive power compensation.

[0044] Example: Assume that the reactive power value of the commercial power is 3, the reactive power value of the photovoltaic power is 4, and the preset reactive power threshold is 2.5. Since 3 > 2.5 and 4 > 2.5, a corresponding compensation signal is output to the photovoltaic controller, and then the intelligent capacitor is controlled to perform reactive power compensation on the commercial power system and the photovoltaic power generation system. Assume that the reactive power value of the commercial power is 2, the reactive power value of the photovoltaic power is 1.5, and 2 < 2.5 and 1.5 < 2.5. Then a corresponding compensation signal is output to the photovoltaic controller, and then the intelligent capacitor is controlled to stop reactive power compensation. Assume that the reactive power value of the commercial power is 3, the reactive power value of the photovoltaic power is 1.5, and 3 > 2.5 and 1.5 < 2.5. Then a corresponding compensation signal is output to the photovoltaic controller, and then the intelligent capacitor is controlled to perform reactive power compensation on the commercial power system. Assume that the reactive power value of the commercial power is 2, the reactive power value of the photovoltaic power is 4, and 2 < 2.5 and 4 > 2.5. Then a corresponding compensation signal is output to the photovoltaic controller, and then the intelligent capacitor is controlled to perform reactive power compensation on the photovoltaic power generation system. By compensating the reactive power of the commercial power system and the photovoltaic power generation system through the above method, the accuracy and efficiency of reactive power compensation are improved, the power quality is improved, and the line loss is reduced.

[0045] Refer to Figure 2 , in step S1, the reactive power value of the commercial power and the reactive power value of the photovoltaic power are detected, which specifically includes the following steps: S2. Pre-write the detection program; S21. Obtain the commercial power voltage data, commercial power current data, commercial power data, photovoltaic voltage data, photovoltaic current data, and photovoltaic power data; S22. Separate the commercial power voltage data, commercial power current data, commercial power data from the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data through the detection program; S23. Determine the reactive power value of the commercial power through the commercial power voltage data, commercial power current data, and commercial power data, and determine the reactive power value of the photovoltaic power through the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data.

[0046] Example: Assume that the commercial power voltage data is U1, the commercial power current data is I1, the commercial power data is P1, the photovoltaic voltage data is U2, the photovoltaic current data is I2, and the photovoltaic power data is P2. Separate the power voltage data U1, commercial power current data I1, commercial power data P1 from the photovoltaic voltage data U2, photovoltaic current data I2, and photovoltaic power data P2 through the detection program. If the power factor data of the commercial power system is cosφ1 and the power factor data of the photovoltaic power generation system is cosφ2, then the apparent power S1 of the commercial power system can be calculated as , and the reactive power value Q1 of the commercial power is calculated as , the apparent power S2 of the photovoltaic power generation system is calculated as , and the reactive power value Q2 of the photovoltaic power is calculated as , the reactive power value of the mains power and the reactive power value of the photovoltaic are processed separately, facilitating subsequent precise compensation for the reactive power value of the mains power and the reactive power value of the photovoltaic.

[0047] Refer to Figure 3 , in step S22, the mains voltage data, mains current data, mains power data are separated from the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data through a detection program, specifically including the following steps: S3. Detect the four-phase electricity through a detection program; S31. Detect the mains voltage data, mains current data, and mains power data from one phase line and the four-phase line; S32. Detect the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data from the two-phase line and the three-phase line.

[0048] Example: In a power grid system with photovoltaics, it is usually four-phase electricity. The detection program independently detects the one-phase line and the four-phase line to obtain the mains voltage data, mains current data, and mains power data, and independently detects the two-phase line and the three-phase line to obtain the photovoltaic voltage data, photovoltaic current data, and photovoltaic power data. Embodiment

[0049] Different from Embodiment 1, Embodiment 2 of the present application discloses an intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller.

[0050] Refer to Figure 4 and Figure 5 , an intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller further includes, in step S11, determining a compensation signal by comparing the reactive power value of the mains power, the reactive power value of the photovoltaic with a preset reactive power threshold, specifically including the following steps: S4. Preset a comprehensive compensation program; S41. Determine the mains reactive power difference through the reactive power value of the mains power and the reactive power threshold; S42. Determine the photovoltaic reactive power difference through the reactive power value of the photovoltaic and the reactive power threshold; S43. Determine and output a compensation strategy through the comprehensive compensation program, the mains reactive power difference, and the photovoltaic reactive power difference; S44. If both the reactive power value of the mains power and the reactive power value of the photovoltaic are greater than the reactive power threshold, and the mains reactive power difference is greater than the photovoltaic reactive power difference, then output a corresponding compensation signal to preferentially compensate the mains power system; S45. If both the reactive power value of the mains power and the reactive power value of the photovoltaic are greater than the reactive power threshold, and the photovoltaic reactive power difference is greater than the mains reactive power difference, then output a corresponding compensation signal to preferentially compensate the photovoltaic power generation system; S46. If the reactive power value of the mains power is greater than the reactive power threshold, while the reactive power value of the photovoltaic power is less than the reactive power threshold, then output the corresponding compensation signal to perform reactive power compensation on the mains power system; S47. If the reactive power value of the photovoltaic power is greater than the reactive power threshold, while the reactive power value of the mains power is less than the reactive power threshold, then output the corresponding compensation signal to perform reactive power compensation on the photovoltaic power generation system; S48. If both the reactive power value of the mains power and the reactive power value of the photovoltaic power are less than the reactive power threshold, then output the corresponding compensation signal to stop the compensation.

[0051] Example: Assume the reactive power threshold is 2. If the reactive power value of the mains power is 3, then the reactive power difference of the mains power can be calculated as 1. If the reactive power value of the photovoltaic power is 2.5, the reactive power difference of the photovoltaic power can be calculated as 0.5. Since 1 > 0.5, output the corresponding compensation signal to the photovoltaic controller, thereby controlling the intelligent capacitor to preferentially compensate the mains power system; if the reactive power value of the mains power is 2.5, then the reactive power difference of the mains power can be calculated as 0.5. If the reactive power value of the photovoltaic power is 3, the reactive power difference of the photovoltaic power can be calculated as 1. Since 1 > 0.5, output the corresponding compensation signal to the photovoltaic controller, thereby controlling the intelligent capacitor to preferentially compensate the photovoltaic power generation system; if the reactive power value of the mains power is 2.5, then the reactive power difference of the mains power can be calculated as 0.5. If the reactive power value of the photovoltaic power is 1.5, the reactive power difference of the photovoltaic power can be calculated as -0.5, then output the corresponding compensation signal to the photovoltaic controller, thereby controlling the intelligent capacitor to preferentially compensate the mains power system; if the reactive power value of the mains power is 1, then the reactive power difference of the mains power can be calculated as -1. If the reactive power value of the photovoltaic power is 3, the reactive power difference of the photovoltaic power can be calculated as 1, then output the corresponding compensation signal to the photovoltaic controller, thereby controlling the intelligent capacitor to preferentially compensate the photovoltaic power generation system; if the reactive power value of the mains power is 1, then the reactive power difference of the mains power can be calculated as -1. If the reactive power value of the photovoltaic power is 1.5, the reactive power difference of the photovoltaic power can be calculated as -0.5, then output the corresponding compensation signal to the photovoltaic controller, thereby controlling the intelligent capacitor to stop the compensation.

[0052] Refer to Figure 6 , after step S48, the following steps are further included: S5. Preset a monitoring program; S51. Remotely monitor and obtain the mains power voltage data, mains power current data, mains power power data, photovoltaic voltage data, photovoltaic current data, and photovoltaic power data through the monitoring program; S52. Determine the operating state data based on the mains power voltage data, mains power current data, mains power power data, photovoltaic voltage data, photovoltaic current data, and photovoltaic power data and output it to the monitoring platform; S53. Realize remote monitoring and management through the monitoring platform.

[0053] Example: The monitoring program remotely monitors the mains voltage data, mains current data, mains power data, PV voltage data, PV current data, and PV power data, then generates the operating status data of the mains power system and the PV power generation system based on the above data, and then outputs the operating status data of the mains power system and the PV power generation system to the monitoring platform, remotely realizing real-time monitoring of the operating status data through the monitoring platform and processing abnormal data.

[0054] Refer to Figure 7 , in step S43, the compensation strategy is determined and output through the comprehensive compensation program, the mains reactive power difference, and the PV reactive power difference, specifically including the following steps: S6. Detect the mains reactive power detection value and the PV reactive power detection value again; S61. Determine the compensation signal by comparing the mains reactive power detection value and the PV reactive power detection value with the reactive power threshold; S62. If the mains reactive power detection value and the PV reactive power detection value are still greater than the reactive power threshold, continuously output the corresponding compensation signal for reactive power compensation until the mains reactive power detection value and the PV reactive power detection value are equal to the reactive power threshold; S63. If the mains reactive power detection value and the PV reactive power detection value are still less than the reactive power threshold, continuously output the corresponding compensation signal to stop compensation until the mains reactive power detection value and the PV reactive power detection value are equal to the reactive power threshold.

[0055] Example: If the mains reactive power detection value is 2.5 and the PV reactive power detection value is 3, and the reactive power threshold is set to 2, and 2.5 > 2, 3 > 2, then continuously output the corresponding compensation signal to the PV controller, and then control the intelligent capacitor for reactive power compensation, continuously adjusting the mains reactive power value and the PV reactive power value until they are equal to the reactive power threshold; if the mains reactive power detection value is 1.5 and the PV reactive power detection value is 1, and 1.5 < 2, 1 < 2, then continuously output the corresponding compensation signal to the PV controller, and then control the intelligent capacitor to stop reactive power compensation.

[0056] Refer to Figure 8 , after step S6, the following steps are further included: S7. Calculate the compensation error value of the intelligent capacitor by comparing the mains reactive power detection value and the PV reactive power detection value with the reactive power threshold; S71. Compare the compensation error value of the intelligent capacitor with the preset compensation error threshold; S72. If the compensation error value of the intelligent capacitor is less than the compensation error threshold, output the corresponding compensation signal for compensation or stop compensation; S73. If the compensation error value of the intelligent capacitor is greater than the compensation error threshold, then output the corresponding alarm signal to the staff to indicate a fault in the intelligent capacitor.

[0057] For example, if the detected value of the utility grid reactive power is 4 and the detected value of the photovoltaic reactive power is 3, and the reactive power threshold is set to 2, then the compensation error value of the intelligent capacitor for the utility grid system can be calculated as 2, and the compensation error value of the intelligent capacitor for the photovoltaic power generation system is 1. If the compensation error threshold is set to 3, and 2 < 3, 1 < 3, then output the corresponding compensation signal to the photovoltaic controller, and then control the intelligent capacitor to continue compensation or stop compensation; if the detected value of the utility grid reactive power is 6 and the detected value of the photovoltaic reactive power is 8, and the reactive power threshold is set to 2, then the compensation error value of the intelligent capacitor for the utility grid system can be calculated as 4, and the compensation error value of the intelligent capacitor for the photovoltaic power generation system is 6. If the compensation error threshold is set to 3, and 4 > 3, 6 > 3, then output the corresponding alarm signal to the photovoltaic controller to indicate to the staff that the intelligent capacitor has failed and needs to be repaired.

[0058] Refer to Figure 9 , after step S73, the following steps are further included: S8. Calculate the rated compensation data of the intelligent capacitor by calculating the utility grid reactive power value and the photovoltaic reactive power value with the reactive power threshold; S81. Calculate the actual compensation data of the intelligent capacitor by calculating the detected value of the utility grid reactive power and the detected value of the photovoltaic reactive power with the reactive power threshold; S82. Determine the actual compensation efficiency of the intelligent capacitor based on the actual compensation data of the intelligent capacitor and the rated compensation data of the intelligent capacitor; S83. Output the corresponding adjustment signal according to the difference between the actual compensation efficiency of the intelligent capacitor and the preset rated compensation efficiency to improve the rated compensation efficiency of the intelligent capacitor.

[0059] Example: If the reactive power value of the mains power is 8 and the reactive power value of the photovoltaic power is 10, and the reactive power threshold is set to 2, then the rated compensation data of the intelligent capacitor for the mains power system obtained by calculation is 6, and the rated compensation data for the photovoltaic power generation system is 8. If the measured value of the reactive power of the mains power is 4 and the measured value of the reactive power of the photovoltaic power is 6, then the actual compensation data of the intelligent capacitor for the mains power system obtained by calculation is 4, and the actual compensation data for the photovoltaic power generation system is 4. The actual compensation efficiency of the intelligent capacitor for the mains power system obtained by calculation is 66.7%, and the actual compensation efficiency for the photovoltaic power generation system is 50%. Assuming that the rated compensation efficiency of the intelligent capacitor is 80%, then the difference between the actual compensation efficiency and the rated compensation efficiency of the intelligent capacitor for the mains power system is 13.3%, and the difference between the actual compensation efficiency and the rated compensation efficiency for the photovoltaic power generation system is 30%. Then, according to the difference between the actual compensation efficiency and the rated compensation efficiency, the corresponding adjustment signal is output to the photovoltaic controller, thereby improving the rated compensation efficiency of the intelligent capacitor, so that the rated compensation efficiency of the intelligent capacitor for the mains power system is 93.3% and the rated compensation efficiency for the photovoltaic power generation system is 110%. Furthermore, the actual compensation efficiency of the intelligent capacitor for the mains power system and the photovoltaic power generation system is 80%, which can meet the demand for reactive power compensation without cutting off the intelligent capacitor for maintenance, reducing the power loss caused by the disconnection of the intelligent capacitor, enabling the intelligent capacitor to continue to be used temporarily until a replaceable intelligent capacitor is found.

[0060] The implementation principle of the intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller in Embodiment 2 of this application is as follows: The compensation strategy is determined through the comprehensive compensation program, and the party with a larger reactive power value exceeding the reactive power threshold is preferentially compensated, improving the compensation efficiency. The operation status data of the mains power system and the photovoltaic power generation system are remotely monitored and managed through the monitoring program, which is conducive to real-time monitoring and adjustment of reactive power. After the intelligent capacitor performs compensation, the compensation result is detected to observe whether the requirements are met. If the compensation error value is greater than the compensation error threshold, it is necessary to improve the rated compensation efficiency of the intelligent capacitor, thereby improving the actual compensation efficiency of the intelligent capacitor. Through the above method, accurate and effective reactive power compensation can be performed on the mains power system and the photovoltaic power generation system, while reducing the power loss caused by intelligent capacitor failures.

[0061] Refer to Figure 10, An intelligent capacitor reactive power comprehensive compensation system based on a photovoltaic controller includes a detection module 1, a comprehensive compensation module 2, a monitoring module 3, a database 4, and an adjustment module 5. The detection module 1 is used to detect the four-phase electricity. There are two detection modules 1, which are respectively used to detect the reactive power values of the mains power system located between the first phase wire and the fourth phase wire and the photovoltaic power generation system located between the second phase wire and the third phase wire. The comprehensive compensation module 2 is used to select to preferentially compensate the mains power system or the photovoltaic power generation system according to the urgency. The monitoring module 3 is used to remotely monitor and manage the operating states of the mains power system and the photovoltaic power generation system. The database 4 is used to store data such as reactive power thresholds and compensation error thresholds. The adjustment module 5 is used to perform calculation and processing based on the detection results of the detection module 1 and call corresponding data from the database 4, and then output corresponding compensation signals or adjustment signals to the photovoltaic controller, thereby adjusting various parameters of the intelligent capacitor.

[0062] The adjustment module 5 includes a processor 51. The processor 51 may include a central processing component such as a CPU or an MPU, or a host system constructed with a CPU or an MPU as the core, including hardware or software. After the measuring instrument has the processor 5131, people can freely control the measuring instrument by programming to make it operate according to people's wishes. The processor 5131 can control local quantity transfer, remote quantity transfer, remote communication, etc. through an internal protocol. The internal protocol generally refers to all protocols that realize mutual communication or connection within the same measuring instrument or the same system, including: part or all of the human-computer interaction protocol, software / hardware (interface) protocol, chip bus (C-Bus) protocol, internal bus (I-Bus) protocol, etc. With the development of integrated circuit technology, some that belong to the external bus (E-Bus) protocol are also classified as internal protocols after being integrated into the chip along with the external bus (E-Bus).

[0063] Embodiment 2 of the present application discloses a computer-readable storage medium.

[0064] A computer-readable storage medium is used to store a computer program of an intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller that can be loaded and executed by the processor 51.

[0065] Computer-readable storage media include, for example: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0066] The above are all preferred embodiments of the present application. Without restricting the protection scope of the present application based on this, therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller, characterized in that: Detect the reactive power value of the commercial power and the reactive power value of the photovoltaic power; Determine the compensation signal by comparing the reactive power value of the commercial power, the reactive power value of the photovoltaic power with a preset reactive power threshold; If the reactive power value of the commercial power or the reactive power value of the photovoltaic power is greater than the reactive power threshold, output the corresponding compensation signal for reactive power compensation; If the reactive power value of the commercial power or the reactive power value of the photovoltaic power is less than the reactive power threshold, output the corresponding compensation signal to stop reactive power compensation.

2. The intelligent capacitive reactive power comprehensive compensation method based on a photovoltaic controller according to claim 1, wherein The detecting the reactive power value of the commercial power and the reactive power value of the photovoltaic power includes: Pre-write the detection program; Obtain the commercial power voltage data, commercial power current data, commercial power data, photovoltaic voltage data, photovoltaic current data and photovoltaic power data; Separate the commercial power voltage data, commercial power current data, commercial power data from the photovoltaic voltage data, photovoltaic current data, photovoltaic power data through the detection program; Determine the reactive power value of the commercial power through the commercial power voltage data, commercial power current data and commercial power data, and determine the reactive power value of the photovoltaic power through the photovoltaic voltage data, photovoltaic current data and photovoltaic power data.

3. An intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller according to claim 2, characterized in that, The separating the commercial power voltage data, commercial power current data, commercial power data from the photovoltaic voltage data, photovoltaic current data, photovoltaic power data through the detection program includes: Detect the four-phase electricity through the detection program; Obtain the commercial power voltage data, commercial power current data and commercial power data from one phase wire and four-phase wires; Obtain the photovoltaic voltage data, photovoltaic current data and photovoltaic power data from two-phase wires and three-phase wires.

4. An intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller according to claim 1, characterized in that, The determining the compensation signal by comparing the reactive power value of the commercial power, the reactive power value of the photovoltaic power with a preset reactive power threshold includes: Preset the comprehensive compensation program; Determine the commercial power reactive power difference through the reactive power value of the commercial power and the reactive power threshold; Determine the photovoltaic reactive power difference through the reactive power value of the photovoltaic power and the reactive power threshold; Determine the compensation strategy through the comprehensive compensation program, the commercial power reactive power difference and the photovoltaic reactive power difference and output it; If both the reactive power value of the commercial power and the reactive power value of the photovoltaic power are greater than the reactive power threshold, and the commercial power reactive power difference is greater than the photovoltaic reactive power difference, output the corresponding compensation signal to preferentially compensate the commercial power system; If both the reactive power value of the commercial power and the reactive power value of the photovoltaic power are greater than the reactive power threshold, and the photovoltaic reactive power difference is greater than the commercial power reactive power difference, output the corresponding compensation signal to preferentially compensate the photovoltaic power generation system; If the reactive power value of the commercial power is greater than the reactive power threshold, while the reactive power value of the photovoltaic power is less than the reactive power threshold, output the corresponding compensation signal to perform reactive power compensation on the commercial power system; If the reactive power value of the photovoltaic power is greater than the reactive power threshold, while the reactive power value of the commercial power is less than the reactive power threshold, output the corresponding compensation signal to perform reactive power compensation on the photovoltaic power generation system; If both the utility grid reactive power value and the photovoltaic reactive power value are less than the reactive power threshold, output a corresponding compensation signal to stop compensation.

5. An intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller according to claim 1, characterized in that: A preset monitoring program; Obtain the utility grid voltage data, utility grid current data, utility grid power data, photovoltaic voltage data, photovoltaic current data and photovoltaic power data through remote monitoring by the monitoring program; Determine the operation status data from the utility grid voltage data, utility grid current data, utility grid power data, photovoltaic voltage data, photovoltaic current data and photovoltaic power data and output it to the monitoring platform; Realize remote monitoring and management through the monitoring platform.

6. The intelligent capacitive reactive power comprehensive compensation method based on a photovoltaic controller according to claim 4, characterized in that, After the step of determining and outputting the compensation strategy through the comprehensive compensation program, the utility grid reactive power difference and the photovoltaic reactive power difference, it includes: Detect the utility grid reactive power detection value and the photovoltaic reactive power detection value again; Compare and judge the utility grid reactive power detection value and the photovoltaic reactive power detection value with the reactive power threshold to determine the compensation signal; If the utility grid reactive power detection value and the photovoltaic reactive power detection value are still greater than the reactive power threshold, continuously output a corresponding compensation signal for reactive power compensation until the utility grid reactive power detection value and the photovoltaic reactive power detection value are equal to the reactive power threshold; If the utility grid reactive power detection value and the photovoltaic reactive power detection value are still less than the reactive power threshold, continuously output a corresponding compensation signal to stop compensation until the utility grid reactive power detection value and the photovoltaic reactive power detection value are equal to the reactive power threshold.

7. An intelligent capacitive reactive power comprehensive compensation method based on a photovoltaic controller according to claim 6, characterized in that, After the step of detecting the utility grid reactive power detection value and the photovoltaic reactive power detection value again, it includes: Calculate the compensation error value of the intelligent capacitor from the utility grid reactive power detection value and the photovoltaic reactive power detection value and the reactive power threshold; Compare the compensation error value of the intelligent capacitor with a preset compensation error threshold; If the compensation error value of the intelligent capacitor is less than the compensation error threshold, output a corresponding compensation signal for compensation or stop compensation; If the compensation error value of the intelligent capacitor is greater than the compensation error threshold, output a corresponding alarm signal to the staff to indicate a fault of the intelligent capacitor.

8. An intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller according to claim 7, characterized in that, After the step of, if the compensation error value of the intelligent capacitor is greater than the compensation error threshold, output a corresponding alarm signal to the staff to indicate a fault of the intelligent capacitor, it further includes: Calculate the rated compensation data of the intelligent capacitor from the utility grid reactive power value and the photovoltaic reactive power value and the reactive power threshold; Calculate the actual compensation data of the intelligent capacitor from the utility grid reactive power detection value and the photovoltaic reactive power detection value and the reactive power threshold; Determine the actual compensation efficiency of the intelligent capacitor from the actual compensation data of the intelligent capacitor and the rated compensation data of the intelligent capacitor; Output a corresponding adjustment signal according to the difference between the actual compensation efficiency of the intelligent capacitor and the preset rated compensation efficiency to improve the rated compensation efficiency of the intelligent capacitor.

9. An intelligent capacitor reactive power comprehensive compensation system based on a photovoltaic controller, which uses an intelligent capacitor reactive power comprehensive compensation method according to any one of claims 1 to 8, is characterized in that, It includes: The detection module (1) is used to detect the four-phase electricity and determine the municipal power grid reactive power value and the photovoltaic reactive power value according to the detection results; The comprehensive compensation module (2) is used to compare the municipal power grid reactive power value and the photovoltaic reactive power value with the reactive power threshold to judge the compensation urgency, and preferentially compensate the party with the higher reactive power value; The monitoring module (3) is used to remotely monitor and manage the operating states of the municipal power grid system and the photovoltaic power generation system; The database (4) is used to store data, including the threshold of the reactive power, the compensation error threshold, and the rated compensation efficiency; The adjustment module (5), according to the detection results of the detection module (1), calls the threshold of the reactive power, the compensation error threshold, and the rated compensation efficiency from the database (4) for comparative calculation processing, and outputs corresponding compensation signals to adjust the reactive power values of the municipal power grid system and the photovoltaic power generation system; or outputs corresponding adjustment signals to adjust the rated compensation efficiency of the intelligent capacitor.

10. A computer-readable storage medium, characterized in that: A computer program is stored, which can be loaded and executed to implement the intelligent capacitor reactive power comprehensive compensation method based on a photovoltaic controller according to any one of claims 1 to 8.

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